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		Calculate molar mass | 
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| Calculations: Formula: Os(C5h5)2 Molar Mass: 320.389 g/mol 1g=3.12120578421856E-03 mol Percent composition (by mass): Element Count Atom Mass %(by mass) Os 1 190.2 59.37% C 10 12.011 37.49% h 10 1.0079 3.15%  | 
		
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